thumb|Engraving of a claymore and armour at Dunvegan Castle (from Footsteps of Dr. Johnson, 1890). A claymore (; from , "great sword")"claymore". Oxford English Dictionary, 2nd ed., 1989. (subscript
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a0231c75164e2fa07e7587a557296d154c0498e806b85b99f0d6006dacf453. Chain 2 (Bitcoin): anchored in block 954729 (2026-06-21T18:16:07Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fb79cf20-080a-4357-8d58-5f10c0632e97.json and https://artists.proofprofile.net/proofs/artist/fb79cf20-080a-4357-8d58-5f10c0632e97.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).